I did all the recommendations and I am still unable to access my Sage 50.  This is terrible because I have bills that need to be paid today!  The only option I have been given is to open a company for 2024 after doing the back up.

Hello ETreds, where are you now with your data? A hotfix patch is now available, see this latest announcement with details on KB 102602. 

Ok thanks, I’ll try that out.

i actually ended up restoring from the most recent old back up so I could get our work done. But I know I lost some work. I’m hoping I’ll be able to restore from the other back up once this issue has been fixed.

I tried this hotfix.   I had downloaded 2020.1.    It still doesn't allow me to open my company files.  I tried restoring from several backups as well and I still get 'company files can't be opened' message.     this is getting ridiculous.

I tried this hotfix.   I had downloaded 2020.1.    It still doesn't allow me to open my company files.  I tried restoring from several backups as well and I still get 'company files can't be opened' message.     this is getting ridiculous.

Make sure the names in file form and what you named your Simply are the EXACT same. I had restored from a back up, named it one thing when I saved it, and then changed the name of my Simply app and it gave me the same message.